Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS3256670 A
Publication typeGrant
Publication dateJun 21, 1966
Filing dateJul 13, 1962
Priority dateJul 23, 1962
Publication numberUS 3256670 A, US 3256670A, US-A-3256670, US3256670 A, US3256670A
InventorsEnnio Tersigni
Original AssigneeEnnio Tersigni
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Prefabricated steel joist adapted for the reinforcement of floors
US 3256670 A
Abstract  available in
Images(6)
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

June 21, 1966 E. TERSIGNI 3,256,670

PREFABRICATED STEEL JOIST ADAPTED FOR THE REINFORCEMENT OF FLOORS 6 Sheets-Sheet 1 Filed July 15, 1962 INVENTOR MJJMM ATTORNEYS June 21, 1966 E. TERSIGNI 3,256,670

PREFABRICATED STEEL JOIST ADAPTED FOR THE REINFORCEMENT OF FLOORS Filed July 13, 1962 6 Sheets-Sheet 2 Y\ a 15 l INVENTOR BY wmwdw ATTORNEYS June 21, 1966 E. TERSIGNI 3,256,670

PREFABRICATED STEEL JOIST ADAPTED FOR THE REINFORCEMENT OF FLOORS Filed July 15, 1962 6 Sheets-Sheet 3 9W4 INVENTOR ATTORNEYS June 21, 1966 E. TERSIGNI 3,255,670

PREFABRIGATED STEEL JOIST ADAPTED FOR THE REINFORCEMENT 0F FLOORS Filed July 13, 1962 6 Sheets-Sheet 4 52 E e E 3 E"- "E a a E is E E N\ i E "-5 k INVENTOR ATTORNEY June 21, 1966 E. TERSIGNI 3,256,670

PREFABRICATED STEEL JOIST ADAPTED FOR THE REINFORCEMENT OF FLOORS Filed July 15, 1962 6 Sheets-Sheet 5 INVENTOR BY UJMWK-M,

ATTORNEYS June 21, 1966 TERs|GN| 3,256,670

PREFABRICATED STEEL JOIST ADAPTED FOR THE REINFORCEMENT OF FLOORS Filed July 13, 1962 6 Sheets-Sheet 6 Fly. [8 ii? INVENTOR BY MJLM MPM ATTORNEYS United States Patent 3,256,670 PREFABRICATED STEEL JOIST ADAPTED FOR THE REINFORCEMENT 0F FLOORS Ennio Tersigni, Via Salaria 330B, Rome, Italy Filed July 13, 1962, Ser. No. 209,510 Claims priority, application Italy, July 26, 1961, 13,507/ 61 1 Claim. (Cl. 52-634) The object of this invention is to provide girders made of steel sheets, for the reinforcement of building floors, suitable to be manufactured at low cost, in mass production to obtain uniformly sized elements adapted to be easily and quickly installed.

This invention provides a double tubular construction with a connection web, obtained from a steel sheet having a thickness from 1 mm. to 3 mm., by an automatically performed shaping process and having any desired length. The raw steel sheet can be previously punched in order to obtain a particular array of holes causing the metal joist to form, in reinforced concrete, an integral unit with the concrete mix which enters through said holes of both the punched tubular members forming the upper and lower wings, and of the web of the joists, so that these will :be entirely embedded within the concrete, particularly when vibration is used.

The particular profile of the joist allows it to be rigid even during the concrete casting and setting stages and to form a support for the casing made of a ribbed sheet for retaining the casting. The joists also form the skeleton and reinforcement of the floor structure.

Joists made of steel sheets for floor reinforcement can be utilized for the carrying structure of a building of reinforced concrete, or for buildings having bearing walls made of bricks or stones, by anchoring said joists to the reinforcing rods of the concrete in the first case or by arranging them within the connection seams in the second case.

The joists can also form the carrier units of the floor and relieve the stresses acting on cement pillars or on iron columns or on bearing walls.

This invention will be hereinafter described only by way of non-limitative example with reference to the attached drawings showing one preferred embodiment of the said invention.

In the drawings:

FIG. 1 is a cross-sectional view of the joist according to this invention;

FIG. 2 is a partial side elevation;

FIG. 3 is a bottom plan view;

FIG. 4 is a top plan view;

FIG. 5 is a perspective view;

FIG. 6 is a cross-sectional view of two coupled carrying joists, with a relief joist and associated connecting plates:

FIG. 7 is a top plan view corresponding to FIG. 6;

FIG. 8 shows the detail of the upper connecting plate, in top plan view;

FIG. 9 shows a cross-sectional View taken along the plane IXIX of FIG. 8;

FIG. 10 shows a cross-sectional view taken along the plane X-X of FIG. 8;

FIG. 11 shows the lower connecting plate, in bottom plan view;

FIG. 12 shows a cross-sectional View of FIG. 11 taken along the plane XIIXII of said figure;

FIG. 13 shows a cross-sectional view taken along the plane XIII-XIII of FIG. 11;

FIG. 14 shows a longitudinal section-a1 view of the plate of FIG. 11;

FIG. 15 shows the profile of a relief joist with a lower channel for a simple rest;

3,256,670 Patented June 21, 1966 FIG. 16 is a side elevational view;

FIG. 17 is a perspective view of the joist of FIG. 15;

FIG. 18 is a front elevational view of the relief joist with a reversed V plate;

FIG. 19 is a side view corresponding to that of FIG. 18;

FIG. 20 is a top plan view.

With reference to FIGS. 1 to 5, this invention provides a metal joist manufactured from steel sheet, sheared and bent by an industrial, continuous and automatic machining. The joist comprises a base or supporting portion 1 which is connected to the web 2 by means of the two inclined sides 3, and ends at its top with a tubular rib i, the top of which is provided with a continuous ridge 5.

As shown in the FIGURES 3 and 4, holes 6 can be provided in the base plate, while other holes 7 start from the sides 3, and pass through the web 2 and the tubular upperrib 4, so as to obtain a light-weight shape without affecting its strength. As aforesaid, the joist is manufactured from a single steel sheet which is bent and welded along the junction edge 8.

FIGURES 6 and 7 show two coupled joists 22 in twin arrangement, connected to a third joist 21 arranged transversely to the joists 22 to relieve the stresses acting thereon.

The connection of the joist 22 with the transverse joist 21 is obtained by an upper plate 9 and a lower plate It) which are shaped to engage both the joists 22 and transverse joist 21 so as to form a rigid unit thus avoiding punching, bolting or other connection devices requiring difficult operations.

The upper plate 9 (shown also in FIGURES 8 to 10) is provided with a longitudinal rib 11 resting on the ridge 5 of the relief joist and with two parallel ribs 12 which rest on the ridges of the two carrying joists located sideby-side. The connection of the upper joist portion is completed by folding the flange 13 against the associated side of the rib 4 of the outer joist.

Thelower connecting plate 10 (shown also in FIGURES 11 to 14) consists of two stiffening ribs 14 provided under the flange of the relief joist, two flanges 15 which are bent against the sides of said joist, and two cross-flanges 16 which are folded onto the outer sides of the two carrier joists located side-by-si-de, as shown in FIGURE 6. In FIGURES l5, l6 and 17 the joist rests on a metal support channel 17 to be used in case of simple support.

If the joist is to be connected to a support metal structure, as for instance a pillar or a girder of metal shape, a connecting plate It is provided having an inverted V shape and located transversely with respect to the head of the joist, said plate 18 being provided with fastening flanges 19 having holes 20 for the direct fixing by means of bolts or any other equivalent means.

This invention has been disclosed in one preferred embodiment and it will be apparent that various changes might be made in the form, construction and arrangement of the parts without departing from the scope of the invention.

What is claimed is:

A joist structure for reinforcement of building floors in concrete mixes comprising in combination a pair of joists arranged side by side and having a hollow lower support portion having in cross section an isosceles triangle shape, the apex of said triangle being directed upwardly, a hollow upper portion having in cross section an isosceles triangle shape, the apex of said triangle being directed downwardly and the leg of said last named portion opposite said apex having a dihedral shape with its apex extending upwardly, a pair of contiguous webs connecting said port-ions to one another, one of said webs forming a unit with said portions and the other web comprising projections of both portions welded to one another, said webs and portions having holes for embedding the joist within the concrete, a third similar joist arranged perpendicularly to said pair of joists, an upper plate having a central longitudinal groove engaging the upper portion of said third joist and two cross grooves engaging the upper portions of said joist pair, a lower plate having two upwardly turned pliable flanges for engaging the lower portions of said joist pair and two upwardly turned rigid flanges engaging the lower portion of said third joist, said upper and lower plate rigidly connecting said joist to :form a unit.

References Cited by the Examiner UNITED STATES PATENTS FOREIGN PATENTS 5/1960 France.

OTHER REFERENCES 10 The Lewen System: page 14, copyright 1912.

FRANK L. ABBOTT, Primary Examiner.

HENRY C. SUTHERLAND, Examiner.

15 M. O. WARNECKE, Assistant Examiner.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US774484 *Nov 1, 1902Nov 8, 1904Chauncey F LufkinMetallic railway-tie.
US991603 *Sep 22, 1910May 9, 1911George William BrooksFireproof beam.
US1351615 *Jan 28, 1920Aug 31, 1920Eugene Brown EdwardMetal construction
US1357073 *Jan 9, 1920Oct 26, 1920Joseph Mooney DermotMetal construction
US1924880 *Feb 7, 1930Aug 29, 1933Budd Edward G Mfg CoOpen truss girder
US2092472 *Dec 4, 1936Sep 7, 1937Rafter Machine CompanyStud and rafter
FR1235452A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3381439 *Oct 21, 1965May 7, 1968United States Gypsum CoStructural member
US3479777 *Mar 22, 1968Nov 25, 1969Concrete Conduit Co IncUnderground utility vault with a ventilator-type grate
US3698224 *Nov 16, 1970Oct 17, 1972Siderurgica Occidental C AProcess for the production of steel structural shapes
US3761046 *Nov 10, 1971Sep 25, 1973Stelmo LtdTable for concrete casting
US4394807 *Mar 20, 1981Jul 26, 1983Carroll Frank ESheet metal structural shape
US4507901 *Sep 19, 1978Apr 2, 1985Carroll Frank ESheet metal structural shape and use in building structures
US4731560 *Feb 7, 1974Mar 15, 1988Owens-Illinois Television Products, Inc.Multiple gaseous discharge display/memory panel having improved operating life
US5163225 *Apr 28, 1992Nov 17, 1992Tube Technology Pty Ltd.Process for forming a structural member utilizing high frequency electrical induction or resistance welding
US5373679 *Aug 9, 1993Dec 20, 1994Tube Technology Pty LtdStructural member and process for forming same
US5403986 *Sep 25, 1991Apr 4, 1995Tube Technology Pty. Ltd.Structural member and method of making by cold rolling followed by induction or resistance welding
US5501053 *Sep 25, 1991Mar 26, 1996Tube Technology Pty., Ltd.Interengageable structural members
US6115986 *Aug 29, 1997Sep 12, 2000Bhp Steel (Jla) Pty LtdStackable box stud
US6131362 *Feb 2, 1999Oct 17, 2000Buecker Machine & Iron Works, Inc.Sheet metal beam
US7231746 *Jan 29, 2004Jun 19, 2007Bodnar Ernest RSheet metal stud and composite construction panel and method
US7832168 *Mar 2, 2009Nov 16, 2010Usg Interiors, Inc.Grid tee for suspension ceiling
US7891155 *Feb 15, 2007Feb 22, 2011Surowiecki Matt FSheet metal header beam
US8181423Mar 15, 2011May 22, 2012Smorgon Steel Litesteel Products Pty Ltd.Beam
US8201384 *Nov 23, 2006Jun 19, 2012Stefan KrestelGirder-like structural element composed of individual parts connected to one another
US8266860Feb 1, 2008Sep 18, 2012Usg Interiors, LlcGrid tee for suspension ceiling
US8397462Jun 3, 2011Mar 19, 2013Usg Interiors, LlcOpen web grid runner
US8567150 *May 16, 2007Oct 29, 2013Airbus Operations SasAircraft pressurized floor
US8672265Mar 5, 2008Mar 18, 2014Airbus Operations SasContainer for air freight transport and fuselage of an aircraft for freight transport
US9021759Jun 13, 2012May 5, 2015Usg Interiors, LlcSerpentine insert for open web grid
US9525685Dec 28, 2015Dec 20, 2016Bank Of America CorporationUser authentication based on other applications
US9600817Mar 4, 2014Mar 21, 2017Bank Of America CorporationForeign exchange token
US9600844Mar 4, 2014Mar 21, 2017Bank Of America CorporationForeign cross-issued token
US9628495Feb 17, 2016Apr 18, 2017Bank Of America CorporationSelf-selected user access based on specific authentication types
US9641539Oct 30, 2015May 2, 2017Bank Of America CorporationPassive based security escalation to shut off of application based on rules event triggering
US20020108345 *Apr 9, 2002Aug 15, 2002Walker Steven H.Metal structural member
US20040182041 *Jan 29, 2004Sep 23, 2004Bodnar Ernest R.Sheet metal stud and composite construction panel and method
US20080134611 *Feb 1, 2008Jun 12, 2008Usg Interiors, Inc.Grid tee for suspension ceiling
US20080155934 *Dec 29, 2006Jul 3, 2008Usg Interiors, Inc.Easy cut suspension grid
US20080196332 *Feb 15, 2007Aug 21, 2008Surowiecki Matt FSheet metal header beam
US20080264936 *Mar 5, 2008Oct 30, 2008Christian GodenziContainer for air freight transport and fuselage of an aircraft for freight transport
US20090013628 *Nov 23, 2006Jan 15, 2009Stefan KrestelGirder-like structural element composed of individual parts connected to one another
US20090158684 *Mar 2, 2009Jun 25, 2009Usg Interiors, Inc.Grid tee for suspension ceiling
US20100032523 *Oct 4, 2007Feb 11, 2010Airbus FranceAircraft fuselage made from longitudinal panels and method of producing such a fuselage
US20100282903 *May 16, 2007Nov 11, 2010Airbus FranceAircraft pressurized floor
US20110078968 *Jun 16, 2010Apr 7, 2011James FerrellSingle Strip - Double Web Ceiling Grid Member
US20110162320 *Mar 15, 2011Jul 7, 2011Smorgon Steel Litesteel Products Pty LtdBeam
US20120328898 *Jul 22, 2010Dec 27, 2012Best Joist Inc.Roll formed steel beam
EP2527554A1 *May 23, 2011Nov 28, 2012Vbi Ontwikkeling B.V.Beam and block floor
EP2527554B1May 23, 2011Mar 18, 2015Vbi Ontwikkeling B.V.Beam and block floor
EP2899328A3 *May 23, 2011Aug 12, 2015Vbi Ontwikkeling B.V.Beam and block floor
WO1991017328A1 *Apr 29, 1991Nov 14, 1991Ram NavonStructural beam
WO2007134790A1 *May 16, 2007Nov 29, 2007Airbus FrancePressure-sealed floor for aircraft
Classifications
U.S. Classification52/634, 52/696, D25/132, 52/842, 52/666
International ClassificationE04C5/065, E04C3/04, E04C5/01, E04C3/09
Cooperative ClassificationE04C3/09, E04C2003/043, E04C5/065, E04C2003/046, E04C2003/0421
European ClassificationE04C3/09, E04C5/065